$ time perl -MMail::Box::Manager -le '
    $m=Mail::Box::Manager->new;
    $f=$m->open(folder=>"Mail/-default");
    print scalar $f->messages
'
Unexpected end of header (C parser):
  charset="iso-8859-1"
3554

real    0m8.222s
user    0m7.928s
sys     0m0.200s